M2SCI function
Last update : 29/7/2004

mtlb_isletter - Matlab isletter emulation function

### Description

There is no Scilab equivalent function for Matlab `isletter` and equivalent instructions are quite ugly, so `mfile2sci` uses `mtlb_isletter(A)` to replace `isletter(A)`. If you want to have a more efficient code it is possible to replace `mtlb_isletter` calls:

  - If `A` is not a character string `tf = mtlb_isletter(A)` may be replaced by `tf = zeros(A)`
  - If `A` is a character string `tf = mtlb_isletter(A)` may be replaced by `tf = (asciimat(A)>=65&asciimat(A)<=90)|(asciimat(A)>=97&asciimat(A)<=122)`

Caution: `mtlb_isletter` has not to be used for hand coded functions.

### Authors

  V.C.